Hi I was posting on io9 on a thread that asked "what scientific fact transformed the way you view the world?" I posted I got that from Brian Greene in The Elegant Universe. Someone responded challenging me with. I'm really having a hard time making sense of his reasoning and why gravity changes this. Also the term "held-still photon" isn't something I've ever come across. Maybe I shouldn't have used the phrase "arrested in time" or something. I'm not looking to one up this guy. I'd just really like this to be clarified. I've spent at least an hour looking into this and I'm pretty sure I'm not mistaken, but I really can't decipher this guys comment.